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Check all the features, scroll the menus, push ALL the buttons, make sure they do what they're supposed to and look VERY carefully at the whole camera, esp. the mirror chamber. Pay attention to whether it's clean or not. A clean, cared-for camera is more likely to be in better shape than one that's not. Make sure you have a lens or two and take LOTS of test shots in all modes, at different exposures, etc.

I live by the rule that if an offer seems too good to be true, it usually is. But that's not to say there are people out there who offer amazingly good deals for reasons unknown to the rest of the world. Check things out and if the camera seems solid, go for it. I wouldn't do it sight unseen though.

Also, how do you know this person? Is there any chance the camera might be stolen?